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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bebb28da30bb142044201aab22b3e3d19d576900693310e572dc8a0c3434cd3b' 
  AND token = 'TBR3J127k/h1+3jdINTMfKT4hixKbN9kRTOoALdZiU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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