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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd82952bdb599f8f6661fdbb07295c47f7a75302c806e45c44556018642eee3e' 
  AND token = 'as7xOw2zYkb3ukIAgHA/+Pv74vcylPHOzot95AybpHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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