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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e6537d18aee6f86d042a140a65b517190ce517691d7d86bfcaa3039aece2529' 
  AND token = 'VvwUVen3Kzn6Bq9eit0npImotOD08N+g8erSwFqq7/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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