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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b0fe24984b8d1e9a0111f077862a15b79f773aaaac1efa013bf855b4e4c382' 
  AND token = 'xTE/+zxKSe6AbdJY+u6dbOh+8bSnsjheJZL3kuBQm+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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