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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27082c952b595da5c253eea829a712165cd01667fc2900b358787d5aa1c5c4c3' 
  AND token = 'VLh33HzkiHdJY7hAssyJOM3qj2zl4RcPi+NunGTJ8h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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