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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48f7decd885c5d0ef609f38b596bb4797d508e8574059f05a7d5238361897663' 
  AND token = 'TT0vLkWJbKrGsokk4on5d/QRZ9jHFRnHWrlIHXC43cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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