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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26ae4a6b1779b836e99925644b5d2908fb4208fa7d6f0b199026d812200cad6c' 
  AND token = 'SGg/86RsiycUg9YLb5g7STp+jEBh1boursh6T7XZL4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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