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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd27cf533dbb2040c086ea4655b05c06694e968681f7f49f1bdecd68cde8347c4' 
  AND token = 'I2MX+85vcVmB17Dxqu796tDvOnqznUSLGReAPPXSs9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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