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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6244f89f7b772b457c01fa52e4d4e5ef32e07992fa962292dda67d81715f9c65' 
  AND token = 'gmu9V1flwGRTlCfzR0I7V8QK7IB4taCHyiu8dKRGl/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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