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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '715a4d40f13f7bc721019dfe0911da182e7020dba9b4298647ee79f265530e36' 
  AND token = '3CyX7J9OgnP7xGXG3kkKD8IQmr9OTTJR25qz4AG+UFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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