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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cced0ec5dfe4a7b91672a010cb6df8f70965a0ae24ec26bddcd12323c83222a' 
  AND token = '+pdxuev8byW6ZHk5pdsGZJkSgNhBQK9CwMnREFIe/iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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