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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ead3eb350d384ab16124c7dd783786561bc63b3f71a7fdb0817e90f5d9e92f' 
  AND token = 'aL6L7p7uxWGL5/Z7T2Pss0G5INXAl4irX7tkCKBqdk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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