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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913ceea12a2e5ecd1814d26ae5332b7366c8b0e87478623f39193c91faf94b2c' 
  AND token = '50vQ4//QCOmfOG3CFU7/izVMkFecIt23ww0650hxOMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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