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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98844dcff918971e3b4a1d86618c36dbe0c96696c5e48d169ef736be990bda9d' 
  AND token = 'U29Erht5sR9jNfVAWj6pFV1WdmDX93VcHWLVTZRYMSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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