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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04be3619593b47f615df097f5a64d609423bf15f93512cd8e12b46b11d3081e2' 
  AND token = 'cR2rNf9ib1SzaStMpK8fN9ayjdSaYzGyhmEwpVo+F2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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