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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13089c3318764622107b64f9bdb2ff70eb7b98dce9b1ad1565467c2d812a893f' 
  AND token = 'OkZQPYpC7pdQJrxlWj4RoASdbw5aHd1ySz/9CrkcXFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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