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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd04d2e920d01dfea31274005ec9582b125fe0d230789da4ea1ea08559cae3864' 
  AND token = 'iGuKsROscxymv6hwYkoR7qVl4M/wAS3OohR37a1W/FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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