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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1832a4bd853c9212f9407696004bb7ee29d3384bb7873b23c555b88ed0eca3f8' 
  AND token = 'Pas/8spYyRw/xpvjihPMy30sHH1MhdREukaaLo3GlV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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