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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e139dfe2f6311ec05d9ac967ce4e5ab6a9da3e2605eda041d227f68a2f56e9' 
  AND token = 'cASUmue8y7BY+p2/YAJLyRFDzdq0ZgvXGnSoHF1Mq/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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