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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a59e086268a9ecebd938d081f5adcd38608a815685a78525380c9df41c767f9c' 
  AND token = 'yCm4kxcSG4QIRQqk154LiPAzf50MKJOOEpVKEhA5G2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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