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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebdaed029bdbf2b3be0b16c43dc031bff67fbfeaf5ddc744c76bf662dd36fbb7' 
  AND token = 'LbNCA0JAWHmBWYIi7vM4nuumNG1fZkbNcKR4KxK0694=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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