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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af2282a33fa6f1a2307e4b575b797dfc8e9fd90b6b7d017251f0769a645a25b' 
  AND token = 'xAW7unVjRusFLYSN9JM9YHpIx48fr0HXOX72AXA2MBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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