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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c099eb1f9b5efdc3f56e0b576cb66028c6629d8d7b1f9be7dad9394d98fb29' 
  AND token = 'R5/oTx1Pdy4ay77LI0HDk/6vo7Pj1tal930NFYQ1cNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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