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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7be09acde948bb05fe3a6f1fef5f1d4b2d381c6bc0bbc46064b7b3f62869fb' 
  AND token = 'NYljiuFADRvvhJktfF7ZNJLEkTIxRiqYZ5Xk3Mz8Y3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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