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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5045c19b8283506f267868790d68ba7d28b337224d3b4518fa30c8dcb22a1ad3' 
  AND token = 'sFey1r3We4RO8VLR/jp6nEAm86ruj1Cy5IPVIe4ufCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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