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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab15415870c543e3e535c06b2e1455d51585cac2529971abc35bce327d164b16' 
  AND token = 'YX0Ug+yzeh/wXVV+KuAhXcon+E8F9esv2V1VNgzM3u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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