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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82aec2c1d725d87616ddd7e45197190822c608c48c0383ac8fe1be2163a1090' 
  AND token = 'tLACpMYv3Fm2W3BET6sIbbyLPCjDAkxK4Urg6qSljQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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