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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40acae0a1b6b16ba5419c59d58b61ada3540768737534d565d36d977c6639111' 
  AND token = '/riNwTJ7TRJsOnHgrx0S6JVwoFYdVAIUrx23mQodIKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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