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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '940f350e697e6dffd0e057bea54ceac8d2cc868c194e8f1a7138ae104b67ddde' 
  AND token = 'T/3TJuZhmK2zF8Fty7pTQygwfauu+nHdRNyOB6G0HOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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