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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30aad7ce09498283f8727c1a01308315b9a6f3be57715a373cf0efeb7e4f78f0' 
  AND token = '5eAqwQE3i8qub7eCOYX/aO1vWFldoS/Vs/u5cLMhKqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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