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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18765e5a3e1a9e546a34edd06c67ebcc13ef383ac3bc5fb79e7cb3b8f6f4c0ea' 
  AND token = 'JfL4kh++TH5rKQ22DdhU0Rlueq/DVGDQFrf6vzTmOc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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