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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d0e626cb6f27dadf5cac133dcb593313e50584e6802d7049454e8bca6be470e' 
  AND token = 'T97a0ZG3pRmDad5Tv3bBJRiwGZtXjYklZDiy2qcfiiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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