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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc8eacdc57799a45c90cef4f7073dfdce9472f3c9b104436e2379683ee58db5' 
  AND token = 'StAiBGGW3Aw4JPSf94nSC27d1D3shNb4maExaROcark=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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