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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad6eb3058a4085e7cf85d7d58eccdb53bd191ae042759334c583ef6e59dde449' 
  AND token = 'bG+HB+JCtfyNOdyRojk/SXJTSirR3FSRCdmcz4aQ5b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}