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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2af93af1bbfbf69c76b98a9c576a21d77034d6b56a2928759b55f147431f0d2' 
  AND token = 'skoV9bDkeP6ngx7V9m1hA10nhxk3vxyhDv17tP4rxeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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