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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57fbda57a2fd19253fbdc0b5ce434c93c6ff6ca0bf98e7f5a8e8f69e6880ad7' 
  AND token = 'rgCwcrha3/VjOMVwcA+6+0YXh4E09WhE0v+snHcAWHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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