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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87dcbe3544d9935a8272cd6b7b72a21184d34a4e421a9270733e85f22d97274f' 
  AND token = 'u2aCaEzrnofBy8QauEHEeaDRt1P7N0ySgUfCP3F3rDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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