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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02946adf04f38fbe150186ee7596a2ea3b522f79dd7449c64e658bd4c724f93' 
  AND token = 'o12I6QQ3Xq30V0Cn2riVYyPJLuuj9HQz2m2Cd7s1r90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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