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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc5c57768bf5c18193c8426ce6149a94167fc3a3c197d49d956304832b25a06' 
  AND token = 'rbOQbsntVAMYaSOE41vNXuzOGqL8aNaOz3sZ7boqzjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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