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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb6797e1c5034b2880069f82c8ff29d03a73f0e0e954b4cc3cd395a61d3c5f66' 
  AND token = '9F1FxoLtK0X1LCVU6ruZg5gh57TkFiHuAT1rtZyqrX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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