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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba01a7ee3e4d46d0cb23b73cf4c839cdf1ae9d26f7b765a540a5b3d39538f35' 
  AND token = 'PbqSEy0YKDXSX2Ke2spEyH+R2t+UnP6kdxbeSNH8av0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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