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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '206dc55826128cc3f9860fbbdbbf84054cb7da1bdb1dc8d72f0c4b6ddb3a9d67' 
  AND token = 'ww16bB6egQqPHoRYSXdeFVNuOPcFdTRdV003/vrf6ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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