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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdccf564d5c67b8fcd7d19af0c2e3f4ef1d5f9f3a37dd388c0dc54bff42c12ae' 
  AND token = 'kHLByw0oejuUMUk2Oresnj/R6z2wqjuJgynpwr4TKT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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