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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17fefb035b3325e1a326527278fd53a94bdcb43ff5101633f0dafe7cc3ce6620' 
  AND token = '19xqrR6QwVoqqtZnmachxn8sw3sjm8XD1d7o3KE72t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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