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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ef21b99a03cb3106baca7e5dc3e9fe7c99253e3a19f6cb60f0b9f4fb91e9c0' 
  AND token = 'Ksg/5paJHZp1nQt7kixYQcYRnWrDAt0NtSg3lqRUags=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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