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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '151ea6c0edbe233d59699a14281ae1d746d4ef2d6a7ac30b597630d7d7f0092d' 
  AND token = 'dvPrJlw3poWPrO/Tf6toypqJFKRkP5l9okbGSmxU3Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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