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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cafeeb8730d8f7656a2bb0d1533be5872f68ebd1f7a4370b100e3dd8360806d0' 
  AND token = 'QkAIty4POGOqy8Vd4XtB5i4iMQ9HNEI+mi+AntdRmaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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