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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '416a75d55e345cd0bc50c73052481083f12e6f0e1ec923b5909070037cb1ad90' 
  AND token = 'dVzphUo3Ondf1l2eP6ljVAEbccF72f8/wi5zgIEP6Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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