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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e65e1460e69d65c396cba78307aa8f4a60497d4e36b484ca3602690a0730d2' 
  AND token = 'mVaFCjt0/o5/v2WLmIb7KPbu0HwiqV1VQWcJyUKp40w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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