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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b134d3d55a2a3a66332114569376f0c0d235c3499524129ec039c2a2d086e41' 
  AND token = 'QyJExBT14bQ3oXGlmHc8mQklluuip8jlDokpWIweFhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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