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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b1bce7bcb49408d0971a4273fb9cb196f37d719f6de0a26420b49743b712c88' 
  AND token = 'NTR5XUdTbOg41LR9+GE6neVQ5DPVQap2QafMXnmT6eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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