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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3391ad36579d4ed3b1a5e007cab8e122ea30af0f992aaa726aafe21e9ec38915' 
  AND token = 'ZfnG4gKYFUygRfSR2sppo1qFgcXlNN9iAJLusYAtlew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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