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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6ddef562e6dce27b9c4ff06b705a9400dc051b436c2493291c5c5f56098083e' 
  AND token = 'TL7Pg2XMYy3v1b9LlcZHjjze3qTCkiohMJ7qEsKQpT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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