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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a052a036f81b6627daa3ed2a829aa32fcf66f70d2ba40a4b1882a17b3441a7f' 
  AND token = 'YR72zxO/rkIeSwEofWQalBQj9cL3jMF6meRh//Ul9HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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