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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937185f317389fe84e3b3cca783c9cdae7ef60817c1b5f0f15a94e01a6ec91c7' 
  AND token = 'xHqmFIuNrSzOwhw0DOUGX8+RP+umuIjz//5g5j+wCOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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