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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3923e7b6246c420083626e774bd235ab9a5747ee2200de2eb70b91f4026103d' 
  AND token = 'EiboZajkEPUZllYEYEhpTr3IhYjb4ixjYfY6M2bguZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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