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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee781ada900fb8b397e4c2f89fcb7dee0000879708f07621636bd6e58e5f212a' 
  AND token = 'JKHfqUVDvLLxwUJEJ/ABUXTbxUOSakWg1/8sH7IJin0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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