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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7134144b0d3966ded3f69560f346ca1791ff6d1e568a2997195452870561832c' 
  AND token = 'fxLhZINEgwkD5Gqz5IzhbgD8f77Qn0Q6NYa3fxxxHxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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