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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cafce564ab801c2f082a31b4817388f69ec7bedb66a3b3af2bc030c7477ca395' 
  AND token = 'x6UFoeL4qaSUh3rgHNsg0VRlzDe+Je1lv1NzGU3Q93A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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