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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ef5f630616133be34baed4c3f96cfda8aadc329f36cfb6e84aa0bb7124585f8' 
  AND token = 'jz3eP3A8KYey74A6aNPQPsR74K23YfszvxQhNGjikAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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