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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994495b14fd88542891aea7a12a8b57a0bafa84c0ca2a5d4ff56f4c139311c46' 
  AND token = 'zKi3haBA9nD4lQh5T/5u6GW3GjXP/chHyQWggfeR8HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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