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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b0cb3cd29473a4cda1d7e2688bf5082543e840547ece95f34dc6d8d18fa0fa7' 
  AND token = '9yen2rEzBdUXIqoHgcl3dmK38eYuVOZlBnoJwDgsL0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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