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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836fd036b6ac0b9e23c9a8f4335795196e06640acfc75514dc9095a4d1a7c782' 
  AND token = '3/w8iRTHJS8pzsqjGHfZ86Rc/96Vabkda7ni13T9E4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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