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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa2776babd3be10e2e02bbe948d1d670b66b735c00447e9bf0081d7c47080ac5' 
  AND token = 'Ur6BGGkRIIriHwnYQFXil/evWfXxLMeQ1t/lu45DaK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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