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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23a7c27d55875c20b2f15d3a7bf301a2a909cfd518afe20a8476581bb0921c7' 
  AND token = '4aBH+vc6CHDLX1AnFVkaemS94Daw6NkXUsfbG1cmXxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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