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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '410c4552ff957faa77b28dfec4ece38689a64abd72dc2282cdbef9e7e8ac993b' 
  AND token = 'bN1sOEilryclIVRm1XFutn9Es7ctMa+oajHumNP5Ows=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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