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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '868b0b3e4406f12584c865e62699d8ef9a460c8f89939b794987aa4a6ea81c61' 
  AND token = '/dceS1bfvGl7aVHzj21N2XgxLGOCesEFvzfq5RS1kh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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